Electrical utility device and motor assembly



- ..,Aug. 21,'1934. P. J. FITZGERALD 1,971,257

ELECTRICAL- UTILITY mw ci: AND MOTOR ASSEMBLY Original Filed June 12. 1931 3 Sheets-Sheet l gwoenloo Ra 2M JZZzye/Md,

Aug. 1 934. P. J. FITZGERALD 1, 7 57 v ELECTRICAL'UTILITY DEVICE AND MOTOR AS SEMBLY Original Filed June i2. 1931' :s sheeisihei v{e Q 1 g- 1934. P. J. FITZGERALD ELECTRICAL UTILITY DEVICE AND MOTOR ASSEMBLY 3 Sheets-Sheet 5 Original File d Jun 12. 1931 Patented Aug. El, 1934 eanerarcar.

LWL 257 TY DEVHKUE ASSLY ,rizsv Patrick r. Fitzgerald, Torrington, an... assignor to The Fitzgerald Manufacturing Company, 'iorrington, Conn... a corporation of Gonnecticut @riginal application .Fune 12, ion; Serial No. 543,921. Divided and this application May 19,

1932, Serial No. 612,357

'7 Claims. (Cl. 259-131) 5 is a division of my co-pending application Se-' rial No. 543,921, filed June 12, 1931.

One of the features of the present invention is a motor and reduction gearing assembly which may be cheaply constructed within close tolerances and which afiords an excellent mechanical connection of the several parts.

A further feature of the device is the production of a reduction gearing contained within a closed housing sothat lubricant cannot escape therefrom, and with a provision on the gearing parts of means for connecting either a tool or a bowl to the gearing and its casing.

These and other objects of the present invention are set forth in the accompanying drawings, in which is illustrated one form of construction thereof, and in which:

Fig. 1 is a vertical diametrical section through the motor gearing assembly, on line 1-1 of Fig. 2.

Fig. 2 is a vertical sectional view substantially on lines 22 of Fig. 1, showing the gearing and a pair of tools connected thereto.

Fig. 3 is a side elevational view or the gearing casing.

Fig. 4 is a horizontal sectional view through the gear casing substantially on line s-s of Fig. 2.

Fig. 5 is. a plan view of the gear casing as shown in Fig. 2.

Fig. 6 is a bottom view of the same.

Fig. 7 is a vertical sectional view through one of the tool sleeves.

Fig. 8 is a sectional view on a somewhat larger scale, substantially on line H of Fig. '2'.

Fig. 9 is an elevational view of the motor shaft.

Fig. 10 is a perspective view showing the relationship oi the tool stem and the tool sleeve and. clutch. i

Fig, 11 is a view, on a smaller scale, showing the motor and gearing assembly in reverse position, with a fruit juice extractor mounted thereon.

Fig. 12 is an axial section, on the same scale as Figs. 1 and 2, through the extractor bowl, reamer and reamer stand. I

Fig. 13 is a plan view, with portions broken away, on the same scale as Fig. 11.

In the drawings, a motor casing comprised of two sections 10 supports the field and field winding 11 for the motor and is provided. on the upper section with a journal bushing 12 for the motor shaft end 13. The motor shaft is formed as a single structure extending from the upper bearing portion 13 to a threaded lower end it (Fig. 9) and is provided with knurled portions 15 and 16 upon which the armature core and the the commutator are secured by force-fitting in well-knownmanner. A cylindrical portion 16o. of the motor shaft is of the same or'greater diameter than the threaded portion is and is mounted in a bearing bushing 17 (Fig. 1). Owing to the relative diameters of the portions 1 1 and 16, the housing 19 may be assembled to the lower motor casing 10, and then the motor shaft may be introduced through the bushing 1'2.

A flange 18 of a gear housing .19 is fixedlysecured as by screws 20 to the fiat end well of the lower section 10 of the motor housing. housing 19 receives the speed reduction elements of the reduction gearingand is closed by a closing plate 21, pins 22 preferably being provided in the two elements for aligning them accurately with regard to one another in position so that they may be tightly secured to form an oil and grease-tight joint, by screws received in the holes 23 (Fig. 6) passing into the casing 19. The closing plate 21 receives a screw 24 having a hardened end with a cup 25 therein for the accommodation of a steel ball 26 which is likewise received in a countersunk hole 2'! (shown in dotted lines atthe bottom of Fig. 9), so that it may operate as a thrust bearing to support the motor shaft and the parts thereon.

The casing 19 has a central cavity 30 to receive an assembly of a worm gear 31 and the two bevel gears 32, 33, which are pinned or otherwise rigidly secured together for rotational movement about the pivot shaft 34. This shaft 34 maybe introduced through a hole in the side of the casing 19, which may be closed by a plug 35 (Figs. 2 and 3) to prevent leakage of grease from the casing. The shaft 34 is preferably threaded for engagement in the structure of the casing 19, as shown in Fig. 2. The worm gear 31 is in mesh with the thread 14 on the motor shaft and is driven thereby. The bevel gears 32 and 33 are respectively in mesh with the bevel gears 36, 37, which are secured to the tool sleeves 38, 39, which are free for rotation within holes in the casing 19. As shown in Fig. 7, the upper end of each sleeve is preferably closed as by a plug 38a to prevent the passage of oil or grease downwardly through the interior of the sleeve whereby it iii might enter a food stuff being prepared by a beatare also preferably formed with. knurled portions 40 which are forced into the central holes of the gears 36, 37 so that these gears are rigidly assembled with the sleeves. The lower ends of the sleeves 38, 39 are provided with notches-41 (Figs. 1, 2, 6, 7 and 10), and with a hole 42 having a greater diameter at the external wall of the sleeve than at the internal wall (Fig.8).

The gears 36, 37 are preferably supported on bearing members 43 which in turn rest on annular flanges of the closing plate 21 so that a cup is provided in which may be placed a suitable lubricating substance 44.

The sleeves 38, 39, extend through the closing plate 21 and the latter is provided with circular flanges 45, spaced from the sleeves and illustrated as having conical internal surfaces. A clamp is provided for each sleeve comprising the conical member 46, having an out-turned rim about which is curled the periphery of the closing disk 47 which has an aperture therethrough, closely fitting the sleeve 38 or 39 so that the assembly of the clamp is guided for sliding movement on the sleeve 38 or 39. A clamp spring 48 is located in each annular recess within the flange 45 and reacts between the closing plate 21 and the bottom of the cup portion 46 to force the latter in a downward direction in Figs. 1 and 2. A clamping ball 49 is located between the inner conical wall of the cup 46 and the wall of the aperture 42 in sleeve 38 or 39.

In the illustrated form shown in'Figs. 1 and 2 a beating tool is provided for each sleeve comprising the stem 60, having a pin 61 thereon for engagement in one of the notches 41 of the sleeve 38 or 39 of a peripheral groove 62. At the bottom of each stem 60 are provided the beating blades 63.

The utility devices may be employed in the position shown in Figs. 1 and 2 for beating operation with the tools in position thereon. As the motor revolves, the threaded portion 14 of the shaft rotates the worm gear 31 about its pivot 34 and therewith the gears,32, 33 cause rotational movement of the gears 36, 37 and ofthe tool sleeves 38, 39 in opposite angular directions of rotation. The engagement of pins 61 in notches 41 causes the tool stems and the beater blades to be carried in rotation therewith and thus cause a stirring or beating by these blades in the usual manner.

It is also possible to invert the device, sothat the gear casing 19 is above the motor and the flanges 49 are uppermost. A bowl 70 having a bottom flange 71 may now be placed upon the device so that the angular slot '72 (Fig. 11) 'will engage the pin 73 on one of the flanges 45, whereby the bowl '70 is held in a definite position upon the flange. The stem of a reaming tool '74 may now be passed through the flange 71 of the bowl 70 and engaged in the sleeve 38 or 39, and driven therefrom by the engagement of its pin 61a in a notch 41 as before. Preferably, the bowl is provided as usual with an upturned diverting wall 75 to prevent the flow of juice toward the motor and gearing. Owing to the exact angular position afforded by the inter-engagement of pin '73 and slot 72, the spout 76 of the bowl is directed toward the right in Fig. 11, for example, when the bowl is seated upon the flange 45 surrounding the sleeve 38. On the other hand, if the bowl be seated on the flange 45 surrounding the sleeve 49, the spout '76 is accurately directed toward the left. In either event, the bowl is held against rotational movement about the tool axis.

It will thus be seen that the present invention within the scope of the appended claims.

provides a very simple reduction gearing which can be fully enclosed. To assist in the closure of the parts, it is preferred to provide felt members 80, around the sleeves which provide passage for rotating elements while seepage of oil is limited and prevented.

In assembling the housing flange 18 with the lower section 10 of the motor casing, it is preferred to provide a wickor twine-filled pocket 81 as an oil reservoir for the motor bearing, and an end of the twine, etc., is carried over the upper end of the bushing 17 and along an internal groove of this bushing to serve as a wick for the capillary conduction of oil to the motor bearing.

For ease in assembly, an aperture 82 is provided in the cover 4'7 for the clamp so that the ball 49 may be inserted and removed, this ball normally being retained in position against inward movement through the wall of sleeve 38 or 39 by reason of the restricted inner diameter of the hole 42, and prevented against downward movement in the position of Figs. 1 and 2 by the presence of the wall of the cup 46.

By this construction, the lower section 10 of the motor casing is connected to 'the flange 18 100 and housing 19 in the initial assembly. The gears .31, 32, 33 may then be inserted in the housing 19.

The hollow shafts 38, 39, with their gears are inserted in the closing plate 21, the springs 48 are placed around the shafts and the cup clamps 46, 5

7 are forced downward and the balls'49 introduced through the apertures 83 into the holes 42. The housing 19 may now be packed with grease or oil and the closing plate placed in position, with the employment of a thin gasket. When o the housing 19 and the closing plate 21 are tightened together, the gear casing is entirely enclosed with the lower bearing screw 24 in position. The motor shaft with its worm, armature and commutator, is then slid through the bushing 19 and by rotation is brought to proper engagement with the worm wheel 31. The upper section of the motor casing may now be placed in position and the thrust bearing screw 24 properly adjusted. When it is desired to oil the elements in the gear 0 casing, the motor may be brought into the position of Fig. 11 and the screw 24 withdrawn for the addition of oil.

With this construction of parts, a rigid assembly is produced which can be supported in the usual manner. The hollow shafts 38, 39 permit the location of the beater blades 63 close to the gears 36, 3'7, which serve as driving devices for these heaters, and likewise the reamer maybe closely connected when the parts are in the position of Fig. 11.

It is obvious that the invention is not limited solely to the form of execution shown, but that it may be modified in many ways in accordance Having thus described the invention, what I claim as new and desire to secure by Letters Patent, is:

1. The combination in an electrical utility device including a housing, a tool sleeve located in major part in said housing and having tool driving portions at its outer end, tool retaining means including a member movable along the sleeve, a spring bearing against the housing and member for forcing the member along the sleeve, of a flange on the housing surrounding and protecting said spring and surrounding said sleeve and of greater external diameter than said member, a

and an aperture co-axial with the sleeve, and a with said tool driving portions thereof.

2. In a driving mechanism forautility device including a driving shaft having a worm thereon, a housing, a bearing on said housing 'to support said shaft for rotation, a hollow tool shaft extending into said housing and supported, for rotation, said tool shaft having its cavity closed within said housing, a worm gear, in mesh'with said worm, a bevel gear connected to said worm gear, said worm and bevel gears being located within said housing, a bevel gear on said tool shaft in mesh with said first bevel gear, and packing means surrounding said tool shaft whereby to prevent the'escape of lubricant from said housing along the exterior of said tool shaft, and means on said tool shaft for driving a tool stem inserted in said hollow tool shaft.

3. In a driving mechanism for a utility device including a driving shaft having a-worm thereon," a housing, a bearing on said housing to support said shaft for rotation, a pair of hollow tool shafts extending into said housing and supported for rotation, each said tool shaft having its cavity closed within said housing, a worm gear in, mesh with said worm, a pair of bevelgears connected to rounding said tool shafts whereby to prevent the escape of lubricant from said housing along the exterior of said tool shafts.

4. The combination in an electrical utility device including a motor having a lubricant-con taining gear housing connected thereon, of apair of hollow tool shaftsjournaled in said housing and driven by said motor through said mechanism and extending outside of said housing, annular flanges on said housing concentric with said tool shafts and each having an alining projec-' tion thereon extending radially with respect to! its tool shaft and angularly arranged with regard to one another, a tool having a stem to enter the cavities of either of said hollow shafts and hav-' gagesaid open-ended slot .and thereby alinej and holdi said spouted bowl in a predetermined position upon said housing, the position of the spout beingdiflerent accordingly as the bowl is placed on one or the other housing flange.

5. In an electric utility device, a lubricant-tight housing, a driving, shaft having the end thereof journaled in said housing and having a worm thereon, a pair of parallel tool shafts having the ends thereof journaled in said housing and disposed in parallel relation to said driving shaft, tool stems removably connected to said tool shafts, and reduction and transmitting worm and bevel gearing disposed between the axes of said ,tool,shafts and said driving shaft within said housing for interconnecting said driving shaft with said tool shafts whereby to drivethe same.

,shaft, a bevel'gear secured to each of said tool shafts within said housing, a horizontal pivot shaft journaled in said housing between the ends of said tool shafts and said driving shaft, a worm gear on said pivot shaft and in mesh with the worm on said driving shaft, and a pair of bevelgears, one directly and fixedly connected toeach face of said worm gearand in mesh with a corresponding bevel gear on each tool shaft whereby to drive the same.

7. The combination in an electrical utility device including a motor having a lubricant con-.

taining gear housing connected thereto, of a hol low tool shaftjournaled in said housing and driven bysaid motor and extending outside of said housing, an annular flange onsaid housing and concentric with said tool shaft and having i an alining projection thereon extending radially with respect to said tool shaft, atool having a stenrtoenter the cavity in said hollow tool shaft and having a radial driving projection thereon, means for providing a projection-receiving notch at the end of said hollow tool shaft for establishing a driving connection with the stem of said tool through ,the projection thereon, a spouted bowl having on its bottom a depending flange of larger diameter than' said flange on said housing with an open-ended slot therein, said depending flange being adapted to flt over said housing flange whereby said alining projection may engage said lopen-ended slot to aline and hold'said bowl in predetermined position on said housing, anda tool holding clutch including a sliding membersurroundingsaid tool shaft and projecting into 

